dist/src/g80_dma.c

fc5a983dSmrg/*
fc5a983dSmrg * Copyright (c) 2007 NVIDIA, Corporation
fc5a983dSmrg *
fc5a983dSmrg * Permission is hereby granted, free of charge, to any person obtaining a
fc5a983dSmrg * copy of this software and associated documentation files (the
fc5a983dSmrg * "Software"), to deal in the Software without restriction, including
fc5a983dSmrg * without limitation the rights to use, copy, modify, merge, publish,
fc5a983dSmrg * distribute, sublicense, and/or sell copies of the Software, and to
fc5a983dSmrg * permit persons to whom the Software is furnished to do so, subject to
fc5a983dSmrg * the following conditions:
fc5a983dSmrg *
fc5a983dSmrg * The above copyright notice and this permission notice shall be included
fc5a983dSmrg * in all copies or substantial portions of the Software.
fc5a983dSmrg *
fc5a983dSmrg * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
fc5a983dSmrg * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
fc5a983dSmrg * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
fc5a983dSmrg * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
fc5a983dSmrg * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
fc5a983dSmrg * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
fc5a983dSmrg * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
fc5a983dSmrg */
fc5a983dSmrg
fc5a983dSmrg#ifdef HAVE_CONFIG_H
fc5a983dSmrg#include "config.h"
fc5a983dSmrg#endif
fc5a983dSmrg
fc5a983dSmrg#include "g80_type.h"
fc5a983dSmrg#include "g80_dma.h"
fc5a983dSmrg
fc5a983dSmrgvoid G80DmaKickoff(G80Ptr pNv)
fc5a983dSmrg{
fc5a983dSmrg    if(pNv->dmaCurrent != pNv->dmaPut) {
fc5a983dSmrg        pNv->dmaPut = pNv->dmaCurrent;
fc5a983dSmrg        pNv->reg[0x00c02040/4] = pNv->dmaPut << 2;
fc5a983dSmrg    }
fc5a983dSmrg}
fc5a983dSmrg
fc5a983dSmrgvoid G80DmaWait(G80Ptr pNv, int size)
fc5a983dSmrg{
fc5a983dSmrg    CARD32 dmaGet;
fc5a983dSmrg
fc5a983dSmrg    size++;
fc5a983dSmrg
fc5a983dSmrg    while(pNv->dmaFree < size) {
fc5a983dSmrg        dmaGet = pNv->reg[0x00c02044/4] >> 2;
fc5a983dSmrg
fc5a983dSmrg        if(pNv->dmaPut >= dmaGet) {
fc5a983dSmrg            pNv->dmaFree = pNv->dmaMax - pNv->dmaCurrent;
fc5a983dSmrg            if(pNv->dmaFree < size) {
fc5a983dSmrg                G80DmaNext(pNv, 0x20000000);
fc5a983dSmrg                if(dmaGet <= SKIPS) {
fc5a983dSmrg                    if(pNv->dmaPut <= SKIPS) /* corner case - will be idle */
fc5a983dSmrg                        pNv->reg[0x00c02040/4] = (SKIPS + 1) << 2;
fc5a983dSmrg                    do { dmaGet = pNv->reg[0x00c02044/4] >> 2; }
fc5a983dSmrg                    while(dmaGet <= SKIPS);
fc5a983dSmrg                }
fc5a983dSmrg                pNv->reg[0x00c02040/4] = SKIPS << 2;
fc5a983dSmrg                pNv->dmaCurrent = pNv->dmaPut = SKIPS;
fc5a983dSmrg                pNv->dmaFree = dmaGet - (SKIPS + 1);
fc5a983dSmrg            }
fc5a983dSmrg        } else
fc5a983dSmrg            pNv->dmaFree = dmaGet - pNv->dmaCurrent - 1;
fc5a983dSmrg    }
fc5a983dSmrg}